This allows xdg-dbus-proxy to be built as a subproject in larger Meson
projects. When built as a subproject, we install into the --libexecdir
and require a program prefix to be specified: for example, Flatpak would
use program_prefix=flatpak- to get /usr/libexec/flatpak-dbus-proxy.
This allows xdg-dbus-proxy to be built as a subproject in larger Meson projects. When built as a subproject, we install into the --libexecdir and require a program prefix to be specified: for example, Flatpak would use program_prefix=flatpak- to get /usr/libexec/flatpak-dbus-proxy.